The New Balance Women's NB Heat Loft Reversible Pullover is a highly rated base layer top for women's running on Amazon. It is made with New Balance's NB Heat technology, which provides excellent insulation and warmth without adding bulk. The top features a reversible design, allowing you to switch up your look. It has a relaxed fit and a half-zip design for easy on and off. The thumbholes on the sleeves offer extra coverage and help keep your hands warm during your runs. Whether you're running in cold weather or layering up for outdoor activities, this base layer top is a versatile and stylish choice for women's running.